Data Sheet

40 : circuit 2a
CODE TO NOTE
CHARACTER VARIABLES:
void play(char note, int
beats)
The char, or character, variable stores character
values. For example, in this sketch, the play()
function gets passed two variables: a character
variable that represents the mucial note we want
to play and an integer variable that represents
how long to play that note. A second array takes
the character variable and associates a frequency
value to it. This makes programming a song easier
as you can just reference the character and not
the exact frequency.
TONE FUNCTION:
tone(pin, frequency,
duration);
The tone() function will pulse power to a pin at
a specific frequency. The duration controls how
long the sound will play. tone() can be used on
any digital pin.
DECLARING AN ARRAY:
array_name[array_size];
To declare an array, you must give it a name,
then either tell Arduino how many positions the
array will have or assign a list of values to the
array. An array must contain all the same type of
variables and be declared as such.
CALLING AN ARRAY:
array_name[index_#];
To call one of the values in an array, simply type
the name of the array and the index of the value.
Don’t forget the index starts at 0, not 1, so to call
the first element, use array_name[0];.
CODING CHALLENGES
CHANGE THE TEMPO OF THE SONG: Experiment with the beatLength;
variable to change the tempo of the song.
MAKE YOUR OWN SONG: Try changing the notes to make a different song. Spaces
“ ” can be used for rests in the song.